<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <meta http-equiv="X-UA-Compatible" content="ie=edge">
  <title>Document</title>
  <style>
    .box{
      width:400px;
      height:400px;
      background:lightblue;
    }
  </style>
</head>
<body>
  <div id="box" class="box"></div>
  <button id="back">向左</button>
  <button id="go">向右</button>
  <script src="https://cdn.bootcss.com/jquery/3.4.1/jquery.min.js"></script>
  <script>
    
  </script>
</body>
</html>